Read customers, sales contracts, receivables, purchase orders and units; create customers in Sienge. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
Turn on the Sienge connector, then ask in plain words. The AI picks the tools.
For construction and real-estate firms that manage customers, sales contracts and receivables in Sienge.
List the customers of the account and filter them by create date. Open one customer to read its phones, addresses and agents.
List the receivable bills of one customer, using its customer id. Then list the installments of one bill with their due dates and amounts.
List the sales contracts, filtered by enterprise or customer. Open one contract to read its customers, units, payment conditions and brokers.
List the purchase orders by status or supplier. Open one order to read its totals and payment condition.
Check the customer list for the CPF or CNPJ first. Then create a natural person with a CPF, or a legal person with a CNPJ. The create call is not retried.
Changes dataThe login page asks for your Sienge subdomain, API user name and API user password.
The subdomain is the first part of your Sienge address (https://yourcompany.sienge.com.br). Create the API user in the Painel de Integrações of your Sienge account and give it access only to the data you need. Sienge limits requests per minute and per day by your API package; a limit answer is passed on to your AI client. This server reads data and creates customers. It does not delete, cancel or post anything. Requested data passes to your chosen AI client and its LLM provider. Disable the API user in Sienge to stop access.
Team and Enterprise: an Owner adds the connector for the organization first.
No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"sienge": {
"url": "https://sienge.usefulapi.io/mcp"
}
}
} Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"sienge": {
"type": "http",
"url": "https://sienge.usefulapi.io/mcp"
}
}
} Run these commands. The second one opens the login page:
Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.
Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Sienge subdomain, API user name and API user password. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper user | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+per user | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this Sienge server only. Ask your AI to run sienge_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with sienge_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with sienge_upgrade before then undoes the cancel. Or write to [email protected].
sienge_list_customerssienge_get_customersienge_list_companiessienge_list_enterprisessienge_list_creditorssienge_get_creditorsienge_list_sales_contractssienge_get_sales_contractsienge_list_receivable_billssienge_list_receivable_installmentssienge_list_purchase_orderssienge_get_purchase_ordersienge_list_purchase_invoicessienge_list_unitssienge_get_unitsienge_list_departmentssienge_create_customersienge_usage_statussienge_request_featuresienge_upgradesienge_cancel_subscriptionFind customers added this month. Review the receivable bills of a customer. Read the sales contracts of an enterprise. Track purchase orders that wait for delivery. Create a customer record. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by Sienge. The server calls the Sienge API with your own Sienge access, so it sees only the data that your account can see.
Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.
The login page asks for your Sienge subdomain, API user name and API user password. See Before you connect for where to find them.
No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Sienge subdomain, API user name and API user password. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Sienge API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Sienge.
Yes, if you approve it. 1 of the 17 Sienge tools can create or change data. The other 16 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this Sienge server only. Cancel any time: your paid plan then runs to the end of the paid period. Run sienge_usage_status to see how many calls you used.
Ask the AI to run sienge_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run sienge_cancel_subscription. Your paid plan continues to the end of the paid period.
Tell the AI what you wanted to do. It can send the request with sienge_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.
Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.
This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.
Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.